mt.exe could not be found using Visual Studio 2015

I'm trying to use Visual Studio 2015 python support but I cannot install through pip. I get this error

> File "C:\Users\adegeo\AppData\Local\Temp\pip-build-qas0tfba\pythonnet\setup.py", line 95, in _find_msbuild_tool
> raise RuntimeError("%s could not be found" % tool)
> RuntimeError: mt.exe could not be found

How can I fix this?
